YSI IQ SensorNet ViSolid Sensor 700 IQ - Manual (Page 17)

ViSolid
®
700 IQ (SW) Commissioning
ba76040e04 05/2014 3 - 5
3.3.6 Distances from the ground and wall
The following graphic indicates the minimum distances of the measure-
ment windows to the ground or wall, which must be observed. The
effect of the distances on the measured value has been determined for
various wall materials (aluminum, black plastic) in the case of a sensor
placed vertically to the wall in drinking water or water with 1000 mg/l
SiO2.
Fig. 3-3 Effect of ground and wall distances on the measurement of TSS
If there is a low level of total suspended solids (< 2000 mg/
l SiO2 or < 1000 mg/l TSS), the effects of the measurement
environment can simulate a higher content of total sus-
pended solids. The effect of the measurement environment
can be reduced by ensuring the optimum conditions (see
section 3.3.2).
At low levels of total suspended solids, a minimum distance
of at least 10 cm must be kept from the ground or wall.
If an optimum installation is not possible due to the struc-
tural conditions at the measuring location (e.g. in narrow
pipelines), the effects of the measurement environment
can be compensated by user calibration (see section
4.2.4).
Pretended
additional amount of
total suspended solids [1000 mg/l SiO2]
Distance x [cm]
2.0
0,9
1.6
0,7
1.2
0,5
0.8
0,3
0.4
0,1
0
0 4 8 12 16 20 24 28 32 36 40
Aluminium (in drinking water each)
x
Aluminium (in water with 1000 mg/l SiO2)
Black plastic material